Good morning, You have pretty good foundation to start urban planning and on a track to reach that goal. There is more than engineering when it come to urban planning. As an engineer in that case you will design highways,streets roads and retention areas for storm water. Layout city,county plans to determine growth. The other side is architecture in urban planning and design.Architects design and deploy the sustainable practices or LEED design.
You are on the right track, just determine what part of urban planning and design you are interested in. Good luck on your future endeavors!